Electric hammer.



B M. DUTTON. ELECTRIC HAMMER. APPLICATION FILED PEB.16, 1909.

gnoenkoz Patented June 28, 1910.

- BSHQETS-BHEET 1.

Q/vitneao UNITED STATES PATENT OFFIGE.

BURTON M. DUTTON, OF RICHMOND, VIRGINIA, ASSIGNOR 0F ONE-HALF TOVILLIAIVJ'. H. OXENHAM, 0F RICHMOND, VIRGINIA.

ELECTRIC HAMMER.

Specification of Letters Patent.

Patented June 28, 1911).

Application filed February 16, 1909. Serial No. 478,250.

To all whom it may-concern:

Be it known that I, BURTON M. DUTTON, citizen of the United States,residing at Richmond, in the county of Henrico and State of Virginia,have invented certain new proved apparatus of this characterwhichconsists essentially of two solenoid coils that are arranged toalternately influence a magnetic core or plunger, so as to effect thereciprocation thereof and impact'the same intermittently against thetool, the plunger being of peculiar formation so as to be well guided inits movement and to strike an effective blow.

A further object of the invention is an improved switching mechanismwhich is actuated by the reciprocating plunger so as to alternatelyenergize the respective solenoids, and which is so constructed that theblow from the plunger is fully imparted before the switch is reversed toeffect the retraction of the plunger, thereby making the frequency ofreciprocation of the plunger relate directly to the strength of theactuating current and rendering unnecessary delicate adjustmentin orderto get the switching mechanism into synchronism with the inertia andlength of stroke of the plunger. And a still further object of theinvention is a switching mechanism that is susceptible of beingcontrolled from the handle of the device, so as to admit of the operatorquickly and conveniently starting or stopping the hammer when desired,and also affording means for adjusting. the length and frequency of theplungefis stroke.

Vith these and other objects in view that will more fully appear as thedescription proceeds, the invention consists in certain constructionsand arranginnents of the parts that. I shall hereinafter fully describe,and then point out the novel features thereof, in the appended claims.

For a full understanding of the invention :::-:1 the merits thereof, andto acquire a -t=wledge of .the details of construction,

reference is to be had to the following description and accompanyingdrawings, in which:

Figure l is a top plan View of an electric hammer constructed inaccordance with my invention; Fig. 2 is a longitudinal section thereof,on-the line 2-2 OfFig. 1; Fig. 3 is an enlarged plan view of theswitching mechanism; and, Fig. d is an enlarged sec tion on the line 44of Fig. 3.

Correspondingand like parts are referred to in the following descriptionand indicated in all the views of the drawing by the same referencecharacters.

This invention consists essentially of two longitudinally alining spacedforward and rear solenoid coils 1 and 1 which are oppositely wound uponsuitable spools 2, the coils being also preferably inclosed irhollow .clindrical jackets 3. At their opposite end S, these coils are fittedinto substantially cuplike forward and rear closures 4: and 4 which aresecured rigidly within the opposite ends of a tubular casing 5, theadjacent ends of the solenoidsf'being disposed beyond the extremities ofthe cup-like closures so as to afford annular guideways 6 betweentheends of the jackets 3 and the inner wall of the casing'5. Slidinglymounted in the respective guideways 6 are annular circumerential guideflanges 7 which are oppositely and longitudinally disposed from themarginal portion of an outstanding collar 8 that is formed at anintermediate point on a longitudinal core or plunger 9. The plunger isformed of suitable magnetic substance, and has its opposite endsprojected into and slidingly mounted in the adjacent ends of the boresof the spools 2 of the forward and rear solenoids, the plunger beingarranged to be alternately influenced by the solenoids, so as to bepulled forwardly and rearwardly thereby and thus caused to reciprocatewithin the casing. When influenced by and moved forwardly in the forwardsolenoid 1, the core is arranged to impact against a tool stock 10 whichis mounted in the forward end of the corresponding spool for a limitedlongitudinal movement therein, the forward extremity of the tool stockbeing reduced, as indicated at 10, with tliereduced portion eXtendingforwardly through an opening 11 formed in the forward closure 4, thereduced portion providing a forwardly facing shoul der 12 which isarranged to bear agairm the closure around the opening, to limit thefor- I ward movement of the stock, while the rearward movement thereofis limited by one or more nuts 13 working upon the prO ectmg extremityof the reduced portion. When retracted under the influence of the rearsolenoid 1 the core is arranged to abut against an expansion spring 14which serves as a buffer and is carried by an" extension 15 projectinginto the rear end of the bore of the rear spool from the adjacentclosure 4*. 1 i

In order to alternately energize the two solenoid coils, I employ aswitching mechanism that is preferably inclosed in a suitable housing 16provided on the exterior of the casing 5. This switching mechanismconsists essentially of a longitudinal switch bar 17 which is mountedfor reciprocatory movement in the housing, and which is formed at oneend, preferably its rear end,

' with a cross-head 18 to which is secured a longitudinally disposedsubstantially flat block 19 of insulating and noncombustible material.Mounted in this block and extendin between the inner and outer facesthereo aretwo longitudinally spaced metallic contacts 20 and 20*, theinner faces of the block 19 and the contacts carried thereby bein groundto present an even surface whici rests against and is movable across theouter surface of a bed 21 also composed of insulating and noncombustiblematerial.

batteries or the like and enters the housing 16, preferably-near theforward end thereof, and is electrically connected to a longitudinallyextending spring contact finger 24.

f'ljhis contact finger is adapted to rest fric-v tionally against theouter face of a contact 25 that is mounted in one end of a cutofi bar 26of insulating material, the cutoff bar extending transversely of thehousing in proximity to the switch bar 17, for a purpose to be presentlydisclosed, while the opposite end of the cutoff bar is pivoted, asindicated at 27. The first named end of the cutoff bar is movablebetween the contact finger 24- and an insulating block 28 having acontact 29 countersunk therein, a spring 30 normally holding the cutoffbar with the opposite faces of the contact 25 in engage ment with thefinger .24 and the contact 29, sov that the current flows from theformer to the latter, from which latter it is conducted to thestationary contact 22 by means of a lead 31. I I

At their outer faces, the metallic contacts 20 and 20 are preferablydisposed beyond the adjacent face of the insulating block 19, and arearrnaged to wipe frictionally across and in continual engagement withtwo spring contact fingers 32 and 32*, so as to alternately conduct thecurrent thereto when the said contacts are intermittently engaged withthe contact 22 upon the reciprocation of the switch bar 17. From therespective contact fingers 32 and 32 the current is designed to beconducted to the forward and rear solenoids 1 and 1 through theinstrumentality of leads 33 and 33, confluent leads 34 and 34 serving toreturn the current to the source of supply after it has flowed throughthe coils.

The necessary reciprocation of the switch bar 17 is effected through theinstrumentality of an angle arm 35 which is rigidly secured to thecollar 8 of the plunger, and which works in a longitudinal slot 36provided in the casing 5, the extremity of the arm being preferablylongitudinally and rearwardly disposed, as indicated at 37, and having athimble 38 mounted thereon for a limited sliding movement. This thimbleacts somewhat as a delayed trip, and is arranged, after the plunger hasimparted a stroke, to slide forwardly upon the extremity of the arm andabut against a rigid collar 39 provided on the switch bar 17, therebymoving the latter forwardly to effect the reversal of the contacts 20and 20 and the energization of the rear solenoid. The rearward movementof the switch bar 17 is effected through the instrumentality of a sleeve40 that is normally free to slide thereon and is su ported in operativeposition in the rear of the thimble 38 by an expansion spring 41encirclingthe switch bar and interposed between the sleeve and thecross-head 18. The sleeve 40 is provided with a friction lever 42 that,in the normal position of the sleeve, is disposed in the path of thethimble 38 so that the latter abuts thereagainst upon its rearwardmovement and thus clutches the sleeve to the switch bar, to move thesame rearwardly and again reverse the contacts so as to energize theforward solenoid. The forward movement of the sleeve 40, under theinfluence of the expansion spring 41, is controlled by a flexibleconnection 43 secured at one end to the sleeve and assing rearwardlythrough the rear end of the housing, and arranged to be reeled upon asheave or drum .44. The sheave is adapted to be turned by a handle orgrip 45 rotatably mounted in. a bifurcated handle frame 46 whichscrewsat its forward end into a threaded socket 47 formed inthe rear closure4. In the present instance, the turning of the sleeve 44 is limited by astop 48 carried by one of the bifurcations of the handle frame 46 andprojecting into a segmental slot 49 ,formed in the sheave, and thuslimiting the extent to whichthe flexible connection-43 may be reeledupon the drum by turning the-handle 45.

In the practical operation of the hammer, when the parts are in thepositions illustrated in Fig. 4:, it is to be observed that thecurrent-flows from the feed'wire 23, along the contact finger 24,through the contacts 25 and-29, and then from the latter, through thelead 31 to the stationary contact 22. Inasmuch as in the position shown,the contact 20 is in engagement with the contact 22, the current willflow from the latter to the former, and thence through the springcontact linger 32 and along the corresponding lead 33, so as to effectthe energization of the forward solenoid 1. This coil, there fore,exerts a strong pull upon the plunger so as to move the same forwardlyin the casing 53 and impact the core against the tool stock, to impartthe desired blow to the tool. Attention is particularly directed to thefact that the annular g1.1ide tlanges '7, in addi-. tion to theirfunction of guiding the plunger in its movement, also serve, inconjunction with the core, as armatul es for the respective coils. sothat the plunger is subjected to an increased magnetic influence. andthus imparts a more effective blow. \Vhile the plunger is movingforw'ardly, the thimble 38 is positioned at the rear end of thelongitudinal portion 37 of the arm and after the plunger has completedits stroke, this thimblc continues its forward movement, sliding fromits inertia forwardly along the arm and abutting against the rigidcollar 39 to carr the same and the switch bar 17 forwardly, the sleeve40 not moving forwardly with the switch bar, but being retained in itsnormal position by the flexible connection 43 and against thecompression of the spring 41. This movement of the switch bar moves thecontact 20 out of engagement with the stationary contact 22 and engagesthe contact 2O with the latter, whereby the currentis conducted offthrough the spring contact finger 32 and the lead 33 to the rearsolenoid 1, which then exerts a rearward pull upon the plunger toquickly retract the same'until the core abuts against the spring 14. Thesudden arresting of the rear movement of the plunger, causes the thimble38 to continue its rearward movement by its inertia, and to slidelongitudi nally of the arm. the thimble then abutting against thefriction lever 42'to clutch the sleeve 40 to the switch bar 17 and movethe latter rearwardly through the'instrumentality of the former, toagain reverse the contacts and energize the forward solenoid 1. Thesleeve 40 is returned to its normal position by the spring 4 as soon asthe thimble 38 releases the friction lever 42, the sleeve thus movingforwardly to take up the slack of the flexible connection 43 and to assume a position so as to be again ready for opcation by the thimble. Theforegoingoperation is repeated indefinitely so long as the currentcontinues to flow to the stationary contact 22.

Should the operator desire to stop the hammer, it is only necessary toturn the handle 45 to IlIll'GQl the flexible connection l3 from the drumH, and thus admit of the sleeve 40 sliding forwardly on the switch bar,through the influence of the expansion spring 41, until the sleeve abutsagainst the cutoff bar 26 to turn the same forwardly against the actionof the spring 30, anddisengage the contact 25 from the contact 2!) so asto break the circuit. The reversal of the aboveoperation sets the hammerin operation. By turning the grip or handle 45, ,it. will be apparentthat when the hammer is in operation, the sleeve t0 may be normally heldin different relative positions on the switch bar 17 so as to cause thethimble 38 to operate the sleeve and return the switch bar to itsrearward position at a sooner or later period, thus regulating thefrequency of the stroke of the plunger, and also the length thereof.

Inasmuch as the inner surface of the block 10 is ground so as'to bearevenly upon the bed 21. it will be apparent that all air gaps areobviated, and since the contacts are embedded in insulating thenoncombustible material, all possibility of sparking is effectuallyprecluded during the movement of the contacts 20 and 20 alternately intoengagement with the stationary contact 22 upon the reciprocation of theswitch bar 17.

From the foregoingdescription, in connection with the accompanyingdrawings, it will be apparent that I have provided an improved electrichammer-in which the solenoid coils are so arranged as to have a longreach and exert a strong initial pull upon the plunger; in which theswitching mechanism is so arranged that the reversal of the current toenergize the rear solenoid does not occur until after the blow has beenfully imparted; which may be conveniently'controlled from the handle tostart or stop the device, or regulate the length and frequency ofmovement of the plunger; which is pos1= tive in action; and whichpossesses certain other advantages that will become at once manifest to.those familiar with devices of -this character.

Having thus described the invention, what I claim is:

1. An electric reciprocating motor including a reciprocatory plunger ofmagnetic material, solenoid coils alternately influencing the plunger toeffect the reciprocation thereof, means for limiting the rcciprocatorymovement of the plunger in one direction, switching mechanism foralternately ener 4e eeaeee gizing the coils, an arm carried by andreciprocating with the plunger and extending in the direction ofreciprocation thereof, and a member mounted for limited sliding move- 5ment on the arm and arranged, when the movement of the plunger in saiddirection is arrested, to slide on the arm in such direction by inertiato actuate the switching mechanism. 2. An electric reciprocating motorincluding a reci rocatory plunger of magnetic material, soenoid coilsalternately influencing the plunger to effect the reciprocation therethemovement of the plunger in either direcj tion is arrest-ed, to slide onthe arm in such direction by inertia to actuate the switching mechanism.

3. An electric reciprocating motor including a reciprocatory plunger ofmagnetic ma- -terial, solenoid coils alternately influencing the plungerto efiect the reciprocation thereof, switching mechanism adapted toalternately energize the coils and embodying a reciprocator switch barmovably mounted independent y of the plunger, and actuating meanscarried by and reciprocating with the plunger and cooperating with theswitch bar to effect the reciprocation thereof by and upon thereciprocation of the plunger, the actuating means having a limitedmovement relative to the switch bar.

4 4. An electric reciprocating motor comprising a reciprocatory plungerof ma netic material, solenoid coils alternately in uencing the plungerto effect the reciprocation thereof, switching mechanism adapted toalternately, energize the coils and including a reciprocatory switch barmovably mounted independently of the plunger, an arm carried by andreciprocating with the plunger and disposed in the direction -ofthereciprocation thereof, and a member having a limited sliding movement onthe arm by inertia and cooperating with the switch bar to effect thereciprocation thereof by and upon the reciprocation of the plunger.

'5. An electric reciprocating motor com prising a reciprocatory plungerof magnetic material, solenoid coils alternately influencing the plungerto effect the reciprocation thereof, switching mechanism adapted toalternately energize the coils and including a reciprocatory switch barmovably mounted independently of the plunger and provided with a rigidcollar, an arm carried by and reciprocating with the plunger anddisposed in the directionof reciprocationthereof, a

member having a limited sliding movement on the arm by inertia andarranged to impact against the collar to move the switch bar in onedirection, and means disposed on the switch bar and cooperating with the7 member for moving the switch bar in the opposite direction.

6. An electric reciprocating motor comprising a reciprocatory plunger ofmagnetic material, solenoid coils alternately influencing the plunger toeffect the reciprocation thereof, switching mechanism adapted toalternately energize the coils and including a reciprocator switch barmovably mounted independent y of the plunger and a member 30 slidablymounted on the switch bar and provided with a clutch, and means carriedby the plunger and cooperating with the member to clutch the same to theswitch bar to effect the movement thereof to reverse the g5 switch.

7. An electric reciprocating motor comprising a reciprocator plunger ofmagnetic material, solenoid coi s alternately influencing-the plunger toeffect the reciprocation thereof, switching mechanism adapted toalternately energize the coils and including a switch bar and a memberslidably mounted on the switch bar, an electric circuit in which saidswitch mechanism is included, a cut-oil bar also included in saidcircuit and arranged in proximity to the switch bar, the member beingspring-pressed toward the cut-01f bar to move the same to break thecircuit, and means for limiting the movement of the member under theinfluence of its spring.

8. An electric reciprocating motor comprising a reciprocatory plunger ofmagnetic material, solenoid coils alternately influencing the plungerand effecting the reciprocation thereof, switching mechanism adapted toalternately energize the coils and including a reciprocatory switch barmovably mounted independently of the plungerand a member mounted on theswitch bar and having a clutch, an electric circuit in which said switchmechanism is included, a cut-ofi bar also included in the circuit andarranged in proximity to the switch bar, the-member being spring-pressedtoward the cut-off bar to move the same to break the circuit, means forcontrolling the movement of the member under the influence of itsspring, and means carried by the plunger and cooperating with the memberto clutch the same to the switch bar and move the latter in the oppositedirection from the movement of the member under the influence of itsspring.

9. An electric reciprocating motor comprising a casing,alining solenoidcoils positioned within the casing in longitudinally spaced relation,the casing being formed intermediate of the solenoid coils with alongitudinal slot, a plunger of magnetic mate rial mounted in thesolenoid coils and arranged to be reciprocated under .the influencethereof, a housing secured on the exterior of the casing over the slot,switching mechanism movably mounted in the housing and adapted toalternately energize the solenoid coils, and means carried by andreciprocating with the plunger and operating in the slot and piojectinginto the housing for actuating the switching mechanism.

10. An electric reciprocating motor coinprising a reciprocatory plungerof magnetic material, solenoid coils alteri'iately influencing theplunger to efiect the reciprocation thereof, switching mechanismarranged to alternately energize the coils and including a rcciprocatoryswitch bar movably mounted independently of the plunger, actuating meanscarried by and reciprocating with the plunger and cooperating with theswitch bar to reciprocate the same by and upon the reciprocation of theplunger, the actuating means having a limited movement relative to theswitch bar, and means for regulating the limited movement of theactuating means relative to the switch bar, whereby to regulate thefrequency and length of the stroke of the plunger.

11. An electric reciprocating motor comprising a reciprocatory plungerof magnetic material, solenoid coils alternately influencing the plungerto effect the reciprocation thereof, switching mechanism arranged toalternately energize the coils and including a reciprocatory switch barmovably mounted independently of the plunger, actuating means carried byand reciprocating with the plunger and cooperating with the switch barto reciprocate. the same by and upon the reciprocation of the plunger,the actuating means having a limited movement relative to the switchbar, a movable handle, and means controlled by the movable handle forregulating the limited movement of the actuating means relative tothe'switch bar, whereby to regulate the frequency and length of thestroke of the plunger.

12. An electric reciprocating motor com prising a reciprocatory plungerof magnetic material, solenoid coils alternately influencing the plungerto effect the reciprocation thereof, switching mechanism adaptedto.alternately energize the coils and including relatively stationaryand movable members of noncombustible and insulating material, themembers having smooth bearing surfaces abutting against each other, acontact sunk in the stationary member flush with the bearing surfacethereof, spaced contacts mounted in the movable member flush with thebearing surface thereof, said spaced con tacts being electricallyconnected to the re spective solenoid coils, and means for reciprocatingthe movable member across the sta tionary member in the direction inwhich the contacts of the former are spaced apart, to alternately engagesaid spaced contacts with the contact in the stationary member, thebearing surfaces of the stationary and movable members being smooth andfitting snugly against each other, whereby to obviate air gaps andsparking in the operation of the switch.

13. An electric reciprocating motor comprising a tubular casing, cuplikeclosures extending across and fitting snugly within the opposite endportions of the casing, longitudinally spaced solenoid coils disposedwithin the casing, hollow spools on whichthe coils are wound,cylindrical jackets inclosing the coils, the remote end portions of thesolenoid coils fitting snugly within the respective cup-like closuresand the adj acent end portions of the solenoid coils projecting inwardlybeyond the cup-like closures to provide annular guide ways beyond theclosures and between the casing and the inner end portions of thejackets, a plunger of magnetic material slidably mounted within thehollow spools of the solenoid coils and arranged to be reciprocatedunder the influence of said coils, a collar outstanding from the plungerintermediate of the solenoid coils, and circumferential flanges disposedoppositely from the collar and fitting snugly to the inner walls of thecasing and within the corresponding guide ways and movable in the latterupon the reciprocation of the plunger.

14. An electric reciprocating motor comprising a reciprocatory plungerof magnetic material, a solenoid coil adapted to influence the plungerto effect the movement thereof in one direction, means for moving theplnnger in the opposite direction, switching mechanism adapted tointermittently energize the coil and embodying a reciprocatory switchbar movably mounted independently prising a reciprocatory plunger ofmagnetic material, a solenoid coil adapted to influence the plunger toeffect the movement thereof in one direction, means for moving theplunger in the opposite. direction, switching mechanism movably mountedindependently of the plunger and arranged to intermittently energize tto coil, and a member carried by and reciprocating with the plunger, themember having a limited sliding movement relative to the plunger andbeing adapted when the plunger has completed its movement in onedirection, to slide relative thereto by inertia to effect the movementof the switching mechanism.

16. An electric reciprocating motor comprising a reciprocatory plungerof magnetic material, a solenoid coil for influencing the I plunger toeffect the movement thereof in one direction, means for moving theplunger in the opposite direction, switching mechanism adapted tointeri'nittently energize the coil and including a switch bar movablymounted independently of the plunger and a member carried by and movablerelatively to the switch bar and provided with a clutch, and meanscarried by the plunger and c0- operating with the member to clutch thesame to the switch bar to efi'ect the movement thereof to reverse theswitch.

l7. An'electric reciprocating motor comprising a reciprocatory plungerof magnetic material, a solenoid coil adapted to influence the plungerto effect the movement thereof in one direction, means for moving theplunger in the opposite direction, an electric circuit in which thesolenoid is included, a movable cut-off bar provided insaid circuit, amember spring-pressed against the cut-off bar to move the same to openthe circuit, and means for limitin the movement of the member under theim uence of its spring.

18. An electric reciprocating motor comprising a reciprocatory plungerof magnetic material, a solenoid coil adapted to influence the plungerto etfect the movement thereof in one direction, means for moving theplunger in the opposite direction, switching mechanism arranged tointermittently energize the 001i and including a reciprocatory switchbar movably mounted independently of the plunger, actuating meanscarried by the plunger and cooperating with the switch bar toreciprocate the same by and upon the reciprocation of the plunger, theactuating means having a limited movement relative to the switch bar,and means for regulating the limited movement of the actuating meansrelative to the switch bar, whereby to regulate the frequency and lengthof the stroke of the plunger.

19. An electric reciprocating motor comprising solenoids coils, areciprocatorv plun gcr projecting into and movable under the influenceof the respective coils, switching mechanism adapted to alternatelyenergize the coils and embodying a reciprocatory switch bar, and asleeve slidably mounted thereon and provided with a clutch, an armcarried by and reciprocating with the plunger, and a thimble having alimited sliding movement on the arm and arranged to actuate the clutchto hold the sleeve on the switch'bar and move the latter in onedirection. v

20. An electric reciprocating motor comprising solenoid coils, areciprocatory plunger projecting into and movable under the influence ofthe respective coils, switching mechanism adapted to alternatelyenergize the coils and embodying a reciprocatory switch bar, a sleeveslidably m0unted-thereon and provided with a clutch, a spring actingupon the sleeve to move the same along the switch bar in one direction,and means for limiting the movement of the sleeve under the influence ofthe spring, and means carried by the plunger and cooperating with thesleeve to clutch the same to the switch bar and move the latter in theopposite direction from the direction of movement of the sleeve, underthe influence of the spring.

21. An electric reciprocating motor comprising solenoid coils, areciprocatory plunger project-in into and movable under the influence oft e coils, switching mechanism "adapted to alternately energize thecoils and embodying a reciprocating switch bar and a sleeve shdinglymounted thereon and provided with a clutch, means carried by the plungerand cooperating with the sleeve for clutching the same to the switch barto move the latter in one direction, and means for. regulating thenormal position of the sleeve.

22. An electric'reciprocating motor comprising solenoid coils, areciprocatory plunger projecting into and movable under the influence ofthe coils, switching mechanism adapted to alternately energize the coilsand embodying a reciprocating switch bar and a spring-pressed sleeve,means carried by the plunger and cooperating with the sleeve, and amember secured to the sleeve to limit the movement thereof under theforce of the spring.

23. An electric reciprocating motor comprising solenoid coils, areciprocatory plunger projecting into and movable under the influence,of the coils, switching mechanism adapted to alternately energize thecoils and embodying a reciprocating switch bar and a spring-pressedsleeve, an operative connection between the plun er and the sleeve, aflexible connecting mem er secured at one end to the sleeve, and asheave adapted to have the connecting member reeled thereon to limit themovement of the sleeve under the influence of its spring.

24:. An electric reciprocating motor comprising solenoid coils, areciprocatory plunger projecting into and movable under the influence ofthe coils, switching mechanism adapted to alternately energize the coilsand embodying a reciprocating switch bar and a spring-pressed sleeve, anoperative connection between the plunger and the sleeve, a flexibleconnecting member secured at one end to the sleeve, a sheave adapted tohave the connecting member reeled thereon to limit the movement of thesleeve under the forceof its spring, and means for turning the sheave.

25 An 'electrie reciprocating motor comprising solenoid coils, areciprocatory plunger projecting into and movable under the influence ofthe coils, switching mechanism adapted to alternately energize the coilsand embodying a reciprocating switch bar and a spring-pressed sleeve, anoperative connection between the plunger and the sleeve, a flexibleconnecting member secured at one end to the sleeve, a sheave adapted tohave the connecting member reeled thereon to limit the movementof thesleeve under the force of its spring, and a rotary handle arranged toturn the sheave.

26. An electricreciprocating motor comprising solenoid coils, areeiprocatory plunger projecting into and movable under the influence ofthe coils, switching mechanism ably mounted on the switch bar andspringpressed toward the entoit bar to move the same and break thecircuit, a handle, and means controlled from the handle for regulatingthe movement of the sleeve under the force of its spring.

In testimony whereof I aflix my signaa ture in presence of twowitnesses.

BURTON M. DUTTON.

Witnesses W'. H. MITCHELL, S. W. Jn'rnn.

